* {
  margin: 0;
  padding: 0;
}
html{
  font-size: 62.5%;
  font-family: "Microsoft YaHei UI";
  height: 100%;
}
body{
  font-size: 62.5%;
  height: 100%;
}
input,button,textarea{
  outline: none;
}

.container{
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}

.page{
  box-shadow: inset 0 0 .5rem .5rem #666;
  position: relative;
  padding: 1rem;
  width: 20rem;
  height: 33rem;
  margin: 2rem auto;
  &::after{
    content: 'feleventh';
    display: block;
    position: absolute;
    top: .5rem;
    right: .5rem;
  }
}
.screen{
  width: 20rem;
  height: 6rem;
  box-shadow: inset 0 0 .2rem .2rem #666;
  margin: 1rem 0 0;
  input{
    width: 18rem;
    height: 4rem;
    border: none;
    padding: .5rem;
    margin: .5rem;
    text-align: right;
    font-size: 2rem;
  }
}
.key-container{
  width: 20rem;
  height: 25rem;
  position: relative;
}
button{
  width: 5rem;
  height: 5rem;
  box-shadow: inset 0 0 .4rem .5rem #666;
  border-radius: .4rem;
  background: #fff;
  font-size: 2rem;
  cursor: pointer;
}
.key-wrap{
  position: absolute;
  top: .5rem;
  left: 0;
  width: 20rem;
  height: 20rem;
  .key-clear,.key-enter,.key-0{
    width: 10rem;
  }
}